Tweak KILL_TRAILING_SPACES. Still deciding on name...

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5675 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

@@ -10,7 +10,8 @@
 2016-02-22  Chris Allegretta  <chrisa@asty.org>
 	* Add the ability to kill the trailing spaces when justifying text,
 	by adding a new nanorc option 'kill_spaces_on_justify' -- we'll see
-	whether this warrants a command-line flag or not.
+	whether this warrants a command-line flag or not.  Now with slightly
+	better logic for multi-spaced lines.
 
 2016-02-22  Benno Schulenberg  <bensberg@justemail.net>
 	* src/nano.c (free_openfilestruct): Elide this function.

src/text.c

@@ -2176,10 +2176,13 @@ void do_justify(bool full_justify)
 #endif
 
 	    /* Break the current line. */
-            if (ISSET(KILL_TRAILING_SPACES))
-		null_at(&openfile->current->data, break_pos - 1);
-	    else
-		null_at(&openfile->current->data, break_pos);
+            if (ISSET(KILL_TRAILING_SPACES)) {
+                while (break_pos > 0 &&
+                       is_blank_mbchar(&openfile->current->data[break_pos-1])) {
+		    break_pos--;
+		}
+	    }
+	    null_at(&openfile->current->data, break_pos);
 
 	    /* Go to the next line. */
 	    par_len--;